<p>Loggers should:</p>
<ul>
  <li><code>private</code>: never be accessible outside of its parent class. If another class needs to log something, it should instantiate its own logger.</li>
  <li><code>static</code>: not be dependent on an instance of a class (an object). When logging something, contextual information can of course be provided in the messages but the logger should be created at class level to prevent creating a logger along with each object.</li>
  <li><code>final</code>: be created once and only once per class.</li>
</ul>

<h2>Noncompliant Code Example</h2>
<p>With a default regular expression of <code>LOG(?:GER)?</code>:</p>
<pre>
public Logger logger = LoggerFactory.getLogger(Foo.class);  // Noncompliant
</pre>

<h2>Compliant Solution</h2>
<pre>
private static final Logger LOGGER = LoggerFactory.getLogger(Foo.class);
</pre>

<h2>Exceptions</h2>
<p>Variables of type <code>org.apache.maven.plugin.logging.Log</code> are ignored.</p>
